Receiver & amp placement

I have my Denon 4800 receiver on the top shelf and my Denon 5200 amp on the shelf underneath it - about 2 or 3 inches. The shelves are made from a coated metal wire frame. The 4800 seems to draw more heat then the 5200 amp. My question....Is the 5200 amp cooking the 4800 by being directly underneath it? Should I move things around? Here is a pic of the rack: http://members.aol.com/drksaint/pics2.html
My logic for keeping the 4800 up top was to give it more room to breath.
------------------MY HOME THEATER

Generally speaking, you should keep your hottest running component on top, so that the hot air rising from it doesn't heat up components above it. This is usually the receiver or the amp. Since you have both, I would place the hotter one on top;, or, if possible, arrange your equipment in two stacks with the receiver at the top of one and the amp at the top of the other.